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Finding the Fourth Proportional to 1,249.40, 1,871.71 and 699.92

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Solution

The fourth proportional to 1,249.40, 1,871.71 and 699.92 is: 1,048.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.40 : 1,871.71 = 699.92 : x
  2. Step 2: Convert to fraction form
    1,249.40/1,871.71 = 699.92/x
  3. Step 3: Cross multiply
    1,249.40x = 1,871.71 × 699.92
  4. Step 4: Simplify right side
    1,249.40x = 1,310,036.15
  5. Step 5: Solve for x
    x = 1,310,036.15/1,249.40
  6. Step 6: Final answer
    x = 1,048.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.